We like to label things. Just as we stereotype people, we stereotype ideas. We discriminate along the axes we have for our ideas, because that's convenient for us. I don't know if we can pull it all the way down to a subconsious hunter/gatherer level or something along the lines "eat/not eat", but there must be something fundamentally "wrong" in our brains when it comes to modern day values.

Our brains can't accept that the world is often gray, it want's easy black and white, us and them. Even the most PC of us will reveal our discriminating ideas in small ways; as all of those who claim to have a non-white friend, when it is mostly an acquaintance, and probably not even that.

That's where literary genres stem from, it is easier to put things down on one axis instead of describing three or four, which would be way better, as pr. Ariella's comment.

In conclusion? No conclusion. Well, there is one, I like those who say that I don't care if I have a black friend or not, I care that I have good friends. So, translated to this, I don't care which genre a book is, as long as it is a good book!
--
When in doubt,
turn around,
cry and shout

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